A formation of a dozen independent green lights moves across the night sky over Las Vegas.

We were outside of our hotel walking back to our room from the pool area. My wife says, "hey, what's that?" I look up in the sky and we all saw about a dozen or so bright neon green-colored lights moving high across the sky. They appeared to flutter somewhat and moved in what appeared to be a distinct tight formation, although they did move in and out around each other like birds -- the first thought I had was that birds is what they were because of their proximity to one another and the way they moved, but that didn't make sense. We did not think that they could have been planes, either, because we actually saw a plane flying across another part of the sky at the same time and there wasn't any similarity whatsoever.

We watched them until they were out of sight, about 2 minutes. None of us had been drinking and we all saw the lights. I kicked myself afterward because I had been holding my camera in my hand the whole time but I was so astonished when I could not figure out what the lights were that I had forgotten about the camera, and so, took no pictures. I have always been a skeptic and was rather disturbed when I couldn't figure out what we were seeing.